Basic magnesium sulfate powder, method for manufacturing basic magnesium sulfate powder, resin composition containing basic magnesium sulfate powder, masterbatch pellet, and molded body

Abstract

A basic magnesium sulfate powder according to the present invention has a surface at least partially coated with an inorganic phosphorus compound. The basic magnesium sulfate powder preferably has a phosphorus content of from 0.001 to 5.0 mass %.

The invention claimed is: 
     
       1. A basic magnesium sulfate powder comprising a surface at least partially coated with an inorganic phosphorus compound, wherein the basic magnesium sulfate is flabellate basic magnesium sulfate, wherein the flabellate basic magnesium sulfate is in a form of particles in which multiple strands of fibrous basic magnesium sulfate are partially joined to each other to form a flabellate shape, and the flabellate basic magnesium sulfate has a mean particle length of from 2 to 100 μm, a mean particle width of from 1 to 40 μm, and a mean aspect ratio in a range from 1 to 100. 
     
     
       2. A basic magnesium sulfate powder comprising a surface at least partially coated with an inorganic phosphorus compound, wherein the basic magnesium sulfate powder has a phosphorus content of from 0.002 to 3.0 mass %, a mean fiber length of from 2 to 100 μm, a mean fiber diameter of from 0.1 to 2 μm, and a mean aspect ratio in a range from 3 to 1000, wherein the inorganic phosphorus compound is selected from the group consisting of magnesium dihydrogen phosphate, ammonium phosphate, ammonium phosphate trihydrate, potassium dihydrogen phosphate, calcium dihydrogen phosphate, sodium dihydrogen phosphate, sodium dihydrogen phosphate dihydrate, potassium phosphate, trisodium phosphate, ammonium hydrogen phosphate, dipotassium phosphate, ammonium dihydrogen phosphate, tricalcium phosphate, calcium hydrogen phosphate, magnesium hydrogen phosphate, magnesium phosphate, barium hydrogen phosphate, lithium phosphate, disodium hydrogen phosphate 12-water, and sodium hydrogen phosphate. 
     
     
       3. The basic magnesium sulfate powder according to  claim 2 , wherein the basic magnesium sulfate is flabellate basic magnesium sulfate. 
     
     
       4. A method for manufacturing the basic magnesium sulfate powder according to  claim 2 , whose surface is at least partially coated with the inorganic phosphorus compound, the method comprising: wet-mixing basic magnesium sulfate and inorganic phosphorus compound; and next performing filtration, washing, and drying. 
     
     
       5. A resin composition comprising: a thermoplastic resin; and the basic magnesium sulfate powder according to  claim 2  in an amount of 1 to 40 mass % of the thermoplastic resin. 
     
     
       6. A masterbatch pellet comprising: a thermoplastic resin; and the basic magnesium sulfate powder according to  claim 2  in an amount of 41 to 75 mass of the thermoplastic resin. 
     
     
       7. A molded body comprising a molded product of the resin composition according to  claim 5 . 
     
     
       8. The basic magnesium sulfate power according to  claim 2 , wherein the inorganic phosphorus compound is selected from the group consisting of magnesium dihydrogen phosphate, ammonium phosphate trihydrate, potassium dihydrogen phosphate, sodium dihydrogen phosphate dihydrate, and disodium hydrogen phosphate 12-water. 
     
     
       9. A method for manufacturing the basic magnesium sulfate powder according to  claim 1 , whose surface is at least partially coated with the inorganic phosphorus compound, the method comprising: wet-mixing basic magnesium sulfate and inorganic phosphorus compound; and next performing filtration. 
     
     
       10. A resin composition comprising: a thermoplastic resin; and the basic magnesium sulfate powder according to  claim 1  in an amount of 1 to 40 mass % of the thermoplastic resin. 
     
     
       11. A masterbatch pellet comprising: a thermoplastic resin; and the basic magnesium sulfate powder according to  claim 1  in an amount of 41 to 75 mass of the thermoplastic resin. 
     
     
       12. A molded body comprising a molded product of the resin composition according to  claim 10 . 
     
     
       13. The basic magnesium sulfate powder according to  claim 1 , wherein the inorganic phosphorus compound is selected from the group consisting of phosphoric acid, magnesium dihydrogen phosphate, ammonium phosphate, potassium dihydrogen phosphate, calcium dihydrogen phosphate, sodium dihydrogen phosphate, potassium phosphate, trisodium phosphate, ammonium hydrogen phosphate, dipotassium phosphate, ammonium dihydrogen phosphate, tricalcium phosphate, calcium hydrogen phosphate, magnesium hydrogen phosphate, magnesium phosphate, barium hydrogen phosphate, lithium phosphate, and sodium hydrogen phosphate. 
     
     
       14. The basic magnesium sulfate powder according to  claim 1 , wherein the inorganic phosphorus compound is selected from the group consisting of phosphoric acid, magnesium dihydrogen phosphate, ammonium phosphate trihydrate, potassium dihydrogen phosphate, sodium dihydrogen phosphate dihydrate, and disodium hydrogen phosphate 12-water. 
     
     
       15. A method of reducing generation of blisters on a surface of an automobile exterior member, which comprises:
 kneading a thermoplastic resin and a basic magnesium sulfate powder comprising a surface at least partially coated with an inorganic phosphorus compound to form a resin composition; and 
 producing the automobile exterior member of the resin composition. 
 
     
     
       16. The method according to  claim 15 , wherein the thermoplastic resin is polypropylene.